The more you try to describe a dream the further it eludes your grasp, retreating before the advance of the words, growing cooler and cooler and paler and paler, until, when you have recorded it all, there is nothing of what it was really like left in your memory.

One can imagine having a procedural rule that anything ambiguous should be treated as the Taj Mahal unless we see that it is labelled "fog"…The motorist replies: "What sort of rule is this? Surely the best guarantee I can have that the fog is fog is if I fail to see the sign saying 'fog' because of the fog."